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One zone has Very low water pressure

I have a 6 zone system, checking the zones this past week i noticed zone 5 the heads (4) have very very low water pressure, I checked for any breaks and didn't see any. All the other zones work perfectly, any idea what to do to get this resolved? I am a novice so please if you do have suggestions figure I don't know anything about anything but enough to get in trouble! Appreciate anyones help here. Thanks.

The easy answer is no. Not for low pressure. If the zone did not respond at all, you may get some information from that test. You either have a leak, bad valve(solenoid or diaphragm), too much water flow through the valve and piping due to poor maintenance or design.

If the valve is bad, wouldn't other zones not work? The system has been working fine for over 5 years and now this, and I did double check fora leak and there is none. I did put a valve pressure regulator on the system last year due to having to much pressure, but doesn't make sense that only one zone would be this much effected by that.

The simple answer again is no.
The zones are tied together with one water source and backflow device, but other than that each zone, station, or valve should be completely independent. That independence is the entire concept of a zone, station, or valve. The zones are made up of irrigation control valves.
I hope this is helping you understand. This is a very common repair that needs to be made.
If there were a problem with all of your zones having low pressure you may conclude that your water source had a problem or you backflow device may have a problem or there may be a leak in the main line.

I have 2 cents worth of info. Well in todays economy maybe 1 cent. I agree with Todd. If you're positive you don't have a break in the line somewhere it's going to be the valve. In my 1 cent worth of experience it's usually the diaphragm. Try turning on the valve with the bleeder screw. If the sprinklers come on full blast then replace the diaphragm or valve adapter depending on the model.

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Me again. If the sprinklers remain the same by opening up the bleeder screw I suspect you have a break. Look again. Let it run a long time. Also make sure the flow control isn't turned down too far.

1st off thanks so much for all the input I do apprecite you taking the time to explain these things to me to try to help meout

Now all i need to do is find out where the Valve is and what it looks like, and where the Diaphragm is and what that looks like If im on target would that be where I put the device to lower the water pressure? can we post pictures on these forms cause I can take a picture and we can go from there?